Dual Modification of a BiVO4 Photoanode for Enhanced Photoelectrochemical Performance,ChemSusChem

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Dual Modification of a BiVO4 Photoanode for Enhanced Photoelectrochemical Performance
ChemSusChem ( IF 7.5 ) Pub Date : 2018-07-09 , DOI: 10.1002/cssc.201800999
Lili Gao _{1,

2} , Feng Li _{1,

2} , Haiguo Hu _{1,

2} , Xuefeng Long _{1,

2} , Na Xu _{1,

2} , Yiping Hu _{1,

2} , Shenqi Wei _{1,

2} , Chenglong Wang _{1,

2} , Jiantai Ma _{1,

2} , Jun Jin _{1,

2}

Affiliation

Bismuth vanadate (BiVO₄) has triggered extensive interest in photoelectrochemical (PEC) water splitting, owing to its narrow band gap and sufficiently positive valence band. However, some defects still exist to block the solar utilization efficiency and hydrogen evolution kinetics. Herein, the NiMoO₄ semiconductor is combined with a BiVO₄ photoanode, for the first time, and excellent PEC performance is achieved on the basis of heterojunction formation and favorable conductivity of NiMoO₄. In addition, it has been demonstrated that NiMoO₄ promotes the light absorption ability, charge separation efficiency, and surface charge‐transfer efficiency comprehensively. To further improve the photoconversion efficiency, cobalt phosphate, as an oxygen evolution reaction cocatalyst, is deposited on the above electrode and achieves a much enhanced utilization efficiency of 1.18 %, with a photocurrent density of 5.3 mA cm⁻² at 1.23 V versus a reversible hydrogen electrode; this exceeds most results reported to date. This rational and unique photoanode construction provides a new thread for the photoelectrode designation.

中文翻译：

BiVO4光电阳极的双重修饰，可增强光电化学性能

钒酸铋（BiVO ₄）由于其窄的带隙和足够的正价带而引起了人们对光电化学（PEC）水分解的广泛兴趣。但是，仍然存在一些缺陷，阻碍了太阳能利用效率和析氢动力学。在此，NiMoO ₄半导体首次与BiVO ₄光电阳极结合，并且由于异质结的形成和NiMoO _4的良好导电性而获得了优异的PEC性能。另外，已经证明NiMoO ₄全面提高光吸收能力，电荷分离效率和表面电荷转移效率。为了进一步提高光转换效率，将磷酸钴作为氧释放反应助催化剂沉积在上述电极上，并实现了1.18％的大大提高的利用效率，在1.23 V下的光电流密度为5.3 mA cm ^-2，而可逆的为氢电极这超过了迄今为止报告的大多数结果。这种合理而独特的光阳极构造为光电极的命名提供了新的思路。

更新日期：2018-07-09

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